|
[Sponsors] |
October 21, 2011, 15:34 |
Wall functions
|
#1 |
New Member
Deepchand Singh Negi
Join Date: Oct 2011
Posts: 12
Rep Power: 14 |
What should be wall functions (in realizable K-Epsilon model) for
y+ < 1 y+= 5-10 y+> 30 And what exactly the physics behind the choosing these different wall functions |
|
October 22, 2011, 01:13 |
|
#2 |
New Member
|
Hey,
You need not define any wall function in different flow regimes. In Enhanced wall function option Fluent will actually solve N-S eqns to find flow pattern (more accurate). Standard wall function is just an interpolation (less accurate). But since Enhanced wall function actually solves the flow you have to make sure that your first grid point lies in distance y+ < 5 (viscous sublayer) There is no y+ < 1 rule as u said. Regards Sabin Mathew |
|
October 22, 2011, 02:07 |
|
#3 |
New Member
Deepchand Singh Negi
Join Date: Oct 2011
Posts: 12
Rep Power: 14 |
thank it was useful
one more thing for enhanced wall function we need the first cell size with y+<5 say if i want or say created another geometry with y+=10 for first cell and again another with y+=30 for first cell what wall function should I use for those two cases (say Standard Wall Function or Non-Equilibrium wall function) |
|
October 22, 2011, 02:28 |
|
#4 |
New Member
|
I don't know what is 'non-equilibrium wall fn', standard wall function is good enough for both the cases.
|
|
October 22, 2011, 02:41 |
|
#5 |
New Member
Deepchand Singh Negi
Join Date: Oct 2011
Posts: 12
Rep Power: 14 |
ok thanks buddy
|
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Modelling Turbulent Wall Functions | victorwfreire | CFX | 11 | January 14, 2015 16:48 |
LES with wall functions, wall boundary, Re 10000 | subba | CFX | 4 | July 10, 2007 06:04 |
Wall Functions | pierre | OpenFOAM Running, Solving & CFD | 0 | October 1, 2005 14:13 |
Wall functions - iterative approach | agg | Main CFD Forum | 1 | May 13, 2005 13:25 |
LES wall functions | barrat | Main CFD Forum | 10 | September 1, 2004 09:29 |